Police cleared a pro-Palestinian tent encampment at the University of Chicago on Tuesday as tension ratcheted up in standoffs with demonstrators at other college campuses around the U.S. — and increasingly, in Europe. Nearly three weeks into a movement launched by a protest at Columbia University, the Rhode Island School of Design held talks with protesters occupying a building, and MIT dealt with a new encampment on a site that was cleared but immediately retaken by demonstrators.